Raw Umber iron-oxide powdered pigment can be used to colour concrete and plaster/gypsum cement products. Raw Umber oxide pigment will not contribute nor be affected by efflorescence. Iron-oxide pigments are weather resistant, non-reactive, non-toxic, non-carcinogenic, will not fade or bleed and provide excellent resistance to acids and alkali. Mix Ratio: 0.5% to 2% by weight. Note: mixing iron-oxide powdered pigments with base materials will decrease colour intensity of pigments.
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